Connect and charge iPhone/iPad with your old Kenwood headunit
Kenwood KCA IP-500 iPhone iPad Kenwood KCA IP-501 iPhone iPad Kenwood iPod interface pinout teardown schematic Adding charging back to old apple accessories
Kenwood offers a great extension box for his car radios with 13pin DIN CD changer plug, which connects your iPod to your headunit's electronics, so you can control it directly from HU's front panel. It acts the same way as playing music from CD, I mean, you don't have to care about it once you've got your iPod plugged in – when you turn ignition off, iPod stops playing and shuts down immediately, and when you turn it back on, it automatically resumes playing from the last position. But we no longer use old iPods, huh? With iPhones and iPads it kinda works too, but it can't charge them at all...
original schematicsI reverse engineered the dock cable schematics to reveal the issue with USB pins – they aren't connected at all! It's OK for old iPods, they include internal regulator which allows charging from FireWire pins (8-30V), but newer iDevices like iPhones and iPads don't support it.
FAQWhy IP-500 doesn't support USB charging? It's been released in 2006...
The IP-500 was propably designed in winter 2004/2005. While Apple apparently announced to manufactures of “Made for iPod” accessories back in 2005 that FireWire charging support would be discontinued in upcoming devices, it was probably too late for IP-500. Kenwood has never updated the kit. I've bought this kit in 2013 as a shiny new accessory and it still uses FireWire pins for charging – how funny On the other side, when released in 2006 it was compatible with all iPods available, no iPhone were exist. Apple finally discontinued FireWire charging support with the iPhone in 2007. New iPods and iPhones can only charge via the USB pin.
An "Accessory Connected" screen pops up on my iDevice every time I connect it to my radio. I'm stuck with my headunit, which interface is horrible to control and generally unusable.
Because of some ridiculous decision in Apple, iPod controls are disabled when connected to serial connection enabled accessory. Depending on your device, there can be a workaround.
babča's mod for iPhone and iPad chargingThere's a 7-pin BD9778HFP step-down switching regulator on the board, which is capable of driving up to 2A load. Sadly, the regulator is set to 8.6Volts (charges iPod @8.6V via FireWire) and according to datasheet it's way too difficult to change it. It probably also powers up the CPU (30302MCP 16bit single-chip CMOS microcomputer), so we have to use own regulator to create 5V voltage.
inside babča's box:
final designIn progress. I'll post some pictures later this month! I'm waiting for a new batch of DC-DC converters
Dobrý! 3 0
can u hit me up on jabber/icq plz? thx...
Zasláno 20. 07. 2015 - 13:22
Maybe What would you like to know?
Zasláno 23. 07. 2015 - 18:15 | profil
just some basic info) or if u can answer on skype? thx) really appreciated
Zasláno 25. 07. 2015 - 10:39
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